TABLE 4.

Interactive effect of vitamin D and dietary magnesium intake on HOMA-IR (All participants).

	Model 1			Model 2			Model 3
Variable	β (95%CI)	P-value	P for interaction	β (95%CI)	P-value	P for interaction	β (95%CI)	P-value	P for interaction
Vit D	−0.02 (−0.02 to −0.01)	<0.001		−0.03 (−0.04 to −0.02)	<0.001		−0.04 (−0.06 to −0.02)	<0.001
Magnesium intake group
<267 mg/day Vit D	−0.02 (−0.02 to −0.01)	<0.001	<0.001	−0.03 (−0.04 to −0.02)	<0.001	<0.001	−0.04 (−0.06 to −0.02)	<0.001	<0.001
≥267 mg/day Vit D	−0.03 (−0.04 to −0.02)	<0.001		−0.04 (−0.05 to −0.03)	<0.001		−0.05 (−0.06 to −0.03)	<0.001

Model 1: non-adjusted. Model 2: adjusted age, sex, race. Model 3: adjusted age, sex, race, obesity, education level, physical activity, smoking status, the season of examination, and dietary calcium intake.